单选题 Commercial application of the research finding will be possible ff salad cream can be made resistant tobacterial attack ______

【正确答案】 D

【答案解析】根据最后一段最后一句"The key will be to do this while keeping the salad cream liquid and not turning it into a solid lmup．”我们就可肯定，该发现的商业应用的前提是[D]。